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(No Model.)

H. A. FELT. WATCH .w M u n@ u w A IOS UNITED STATES PATENT OFFICE.

HOWARD A. FELT, OF OSHAVVA, CANADA.

WATCH.

SPECIFICATION forming part of Letters Patent No. 494,919, dated April 4,1893.

Application filed November 2, 1891. Serial No. 410,692. (No modell.)

T0 all whom it may concern:

Be it known that I, HOWARD A. FELT, a subject of the Queen of GreatBritain, residing at the town of Oshawa, Province of Ontario,Do minionof Canada, have invented certain Improvements in Watch-Movements; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,in which- Figure l is a perspective view of the back plate of a watchmovement containing myimprovements. Fig. 2 is a like view of the samewith the upper balance-cock and balance removed. Fig. 3 is a perspectiveView of said back-plate and the lower balance-cock separated from eachother. Fig. 4 is a section upon line 0c, of Fig. 1. Fig. 5 is aperspective view of the back-plate and balance-cocks, as arranged foruse in adjusting the balance wheel and its connected parts. Fig. 6 is alike view of the same with the upper cock and the balance removed, andFig. 7 is a section upon line z, a', of Fig. 6.

Letters of like name and kind refer to like parts in each of thefigures.

My invention is applicable to all kinds of watch movements, but is moreespecially intended for use in full plate movements, and has for itsprincipal object the ready removal of the lower balance-cock for thepurpose of placing in or removing from position the pivot jewels. It isalso intended to provide an easy and ready means for adjusting andtesting the balance and its connecting parts while held in the samerelative positions which they occupied when in the movement, and to suchend my said invention consists in the construction and combination ofthe balancecocks and back-plate, substantially as and for the purposehereinafter specified.

In the carrying of my invention into practice, I provide within theback-plate A of a watch-movement,im mediately adjacent to andcommunicating with the opening a through which is to pass the balancestaff, a recess a that extends about one half way through said plateand, preferably, has the form in plan view of two circles whichintersect each other and said opening a. Into the recess a is fitted acook B, for sustaining and pivoting the lower end c of the balance arborC, which cock while having the usual form below the plate A, has suchadditional length as to enable its shank to be contained within saidrecess,in stead of being attached to the lower side of said plate. Thesaid shank has such shape and dimensions as to cause it to substantiallyfill said recess Iiush with the upper face of said back-plate, and isheld in place by means of a set screw l) and the usual dowel pins h andb. The upper end of the balance-staff O is pivoted within an ordinarybalance-cock D which is attached to or upon the plate A in the usualmanner, and covers the recess a and the shank of the lower cock B. Asthus constructed` whenever it becomes necessary to inspect or repair thelower cock, access to the same can be easily and quickly had by theremoval of the upper cock and balance when, if necessary, said lowercock can also be removed without interference with the train.

Vhen it is desired to adjust and test the balance, and its connectingparts, the balance cocks are removed,and the lower cock B is securedupon or within the edge of the plate A, the end of its shank being,preferably, placed in a correspondingly shaped recess d2 which isprovided for the purpose at such point, and secured therein by means ofascrew, after which, the upper cock D is placed in position over saidlower cock-with the balance in place between-and secured in position byits dowel pins and screw, for which suitable provision has been made insaid plate. As thus arranged it will be seen that both cocks projectbeyond the movement plates with every part of the balance, and itsconnecting parts are in plain sight with each occupying the preciseposition with relation to the other parts that it sustains when in themovement, so that the operator can readily determine whether or noteverything is correct, and when found to be so, can transfer the partsto their normal positions with certainty that no relative change will becaused by such transfer.

While, as before stated, I preferably provide recesses for the receptionof the shank of the lower cock,such recesses are not essential, as saidcock shank may, if desired, rest upon and be fastened directly to theupper face of the movement plate.

Having thus described my invention, what I claim is- 1. As animprovement in Watch-movements, a cock for the lower end of a balancesta which is secured upon the outer side of the back-movement plate, andextends through the same into the space provided for the train,substantially as and for the purpose speciiied.

2. As an improvement in Watch-movements, in combination with the backplate of a watch movement,a cock for thelower end of a balance staiwhich is secured upon the outer side of and projects through such plate,and a cock for the upper endof such staff that is fastened to andprojects above the outer face of said plate, substantially as and forthe purpose shown.

3. As a means for testing and adjusting a Watch balance and itsconnecting parts, the

combination with a back movement plate, of-

Witnesses:

E. O. FELT, J. P. PALMER.

